The ROSAT North Ecliptic Pole Survey: The X-Ray Catalog

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© 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation J. Patrick Henry et al 2006 ApJS 162 304 DOI 10.1086/498749

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Author affiliations

1 Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Drive, Honolulu, HI 96822

2 Department of Astronomy, University of Michigan, 501 East University Avenue, Ann Arbor, MI 48109

3 Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, Garching D-85741, Germany

4 Istituto di Radioastronomia INAF-CNR, Via Gobetti 101, I-40129, Bologna, Italy

5 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 01970

6 Visiting Astronomer at the Canada-France-Hawai'i Telescope, operated by the National Research Council of Canada, le Centre National de la Recherche Scientifique de France and the University of Hawai'i, at the W. M. Keck Observatory, jointly operated by the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration and Observer at the University of Hawai'i 2.2 m telescope

7 Some observations reported here were made at the Multiple Mirror Telescope Observatory, a joint facility of the Smithsonian Institution and the University of Arizona

Dates

  1. Received 2005 April 19
  2. Accepted 2005 September 27
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0067-0049/162/2/304

Abstract

The sky around the north ecliptic pole (NEP), at α(J2000.0) = 18h00m00s, δ(J2000.0) = +66°33'39'', has the deepest exposure of the entire ROSAT All-Sky Survey (RASS). The NEP is an undistinguished region of moderate Galactic latitude, b = 29fdg8, and hence suitable for compiling statistical samples of both Galactic and extragalactic objects. We have made such a compilation in the 80.6 deg2 region surrounding the NEP. Our sample fully exploits the properties of the RASS, since the only criteria for inclusion are source position and significance, and it yields the deepest large solid angle contiguous sample of X-ray sources to date. We find 442 unique sources above a flux limit ~2 × 10-14 ergs cm-2 s-1 in the 0.5-2.0 keV band. In this paper we present the X-ray properties of these sources as determined from the RASS. These include positions, fluxes, spectral information in the form of hardness ratios, and angular sizes. Since we have performed a comprehensive optical identification program we also present the average X-ray properties of classes of objects typical of the X-ray sky at these flux levels. We discuss the use of the RASS to find clusters of galaxies based on their X-ray properties alone.

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10.1086/498749